The easiest way to beat the water-type gym leader is by using a strong grass or electric type Pokemon. If you use grass though, watch out for ice-type moves because it will make the battle much harder. Some Pokemon that would be useful are Breloom, Sceptile, and Vileplume for grass-types and Raichu, Magneton, and Manectric for electric-types. Also be sure to bring ice heals and hyper potions.
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Go to Mawille(eletric gym town) and there will be a gym leader... there is no gym leader
the 6th gym leader is in fortree city after the weather station where you get castform
keep using phychic
You beat Roxanne the first gym leader in Rustbordo City
First beat the Mauville Gym leader, Wattson.